My MB42 fireplace with digital fireplace burner control (SIT Proflame) will not stay on after starting. It shuts off many times, and only on a 6th try or so, will stay on.
The controller has a single wire connection to the "pilot flame sensor."
I suspect the sensor, and want to replace it.
However, I am confused by this sensor, as it has just one lead. Watching Fire Place repair videos I learned that there are thermocouple and thermopile sensors, but mine seems to be neither.
It does not have the two leads of the thermopile, nor the single tube of the thermocouple.It just has a single connection to CN4 on the controller.
What is this single-wire flame sensor called? It's the one on the left. The one on the middle looks similar, but is slightly wider and provides the spark.
A little more on the symptoms: when just started, will shut off repeatedly. Sometimes before the main burner switches on, but sometimes when main burner is already on.
Once the main burner has been on for at least a minute, it will stay on.